Refractory brick



FIG. 1 is a front, top perspective view of a refractory brick showing mynew design;

FIG. 2 is a back, top perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a left-side view thereof;

FIG. 7 is a right-side view thereof; and,

FIG. 8 is a bottom view thereof.

The ornamental design for the refractory brick, as shown and described.